18002066 has 4 divisors (see below), whose sum is σ = 27003102. Its totient is φ = 9001032.

The previous prime is 18002059. The next prime is 18002111. The reversal of 18002066 is 66020081.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 15960025 + 2042041 = 3995^2 + 1429^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4500515 + ... + 4500518.

Almost surely, 2^18002066 is an apocalyptic number.

18002066 is a deficient number, since it is larger than the sum of its proper divisors (9001036).

18002066 is an equidigital number, since it uses as much as digits as its factorization.

18002066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9001035.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 18002066 is about 4242.8841605681. The cubic root of 18002066 is about 262.0841657997.

The spelling of 18002066 in words is "eighteen million, two thousand, sixty-six".